Furnace-door.



No.876,819. I PATENTEDJAN.14,1908.

H. H. MAGWIREr FURNACE DOOR. APPLICATION FILED Nov. 21. 1906.

2 SHEETS-SHEET 1.

a wcmfoz PATENTED JAN. 14, 190 8.

H. H. MAGWIBE. FURNACE DOOR.

APPLIGATION FILED NOV. 21.1906.

2 SHEETSSHEET 2.

glnvautoz UNITED srrnfrns PATENT 1 onsron.

HAZE HAMILTON MAGWIRE, or MONTPELIER, IDAHO.

nunnecn noon.

Specification of Letters Patent.

Patented Jan. 14, 1908.

Application filed November 21. 1906. Serial No. 344-523- furnaces.

i I tion on the line 33 of Fig. 1.

The invention aims as a primary object to.

provide a door embodying means for insuring a more perfect combustion of fuel and a consequent reductlon in the amount of smoke and in the' amount of fuel consumed. This 1 I j v in between which is a vertical post 9. Adj aobject is attained by the provision of novel air admission and deflecting means whereby the draftshall be induced directly over the fire box to permit 'of the air acting upon the furnace gases to reduce the uncon'sumed'carbon particles therein. 1

The invention aims as a further object to providenovel means for regulating the amount of air admitted through the door into the furnace.

The detailed construction will appear the course of the following description, in which reference is made to the accompanying drawings formin a part of this specification,

like characters 0 reference designating similar parts throughout the several views where- Figure 1 is a front elevation of a fu hace door constructed in accordance with m invention.- Fig. 2 is a side elevation o the same looking towards the hinges located at one side thereof. Fig. 3 is a horizontal-sec- Fig. 4 is a fragmentary rear elevation showing the deflecting hood. Fig. 5 is a view illustrating in front plan and pers ective' the respective members of the lower hinge joint, to be hereinafter specifically referred to,-'and 6 is a fra mentary front elevation of a'shghtly modi ed form of ,air, or draft regulating device. j v

The invention specifically embodies a sub stantially oval open frame 1 to the fuel opening of the furnace and to which the door 2 is hinged. To this end the frame 1 is provided with spaced ears 3 having alined a ertures therein toreceive the intle 4. T e. ears 3 serve as stationary e members tosupport he door 2, the latthe door in its closed positlon. To this provided on .the side opposite v as at 19'to afford a handle. has a portion thereof shaped to en age the.

which is secured.

ter being provided on one side thereof with spaced ears 5 which rest upon the adjacent ears '3 and through which the pintle 4 is inserted. For the purpose of preventing accidental movement of the vdoor in its closed or open position by reason'of the motion of the engine or for other well known causes the lower ear 5 is provided with angularly dis posed ribs 6, illustrated in Fig. 5 which engage in correspondingly arranged grooves 7 in the adjacent ear 3.

engage in the grooves7 with sufiicient accidental movement of the the sides/of said grooves as camswhen the door is swung in either direction by the operator.

The door 2 is formedopenings 8 therecent the outer side edges of the'openings 8 are vertical overhanging flanges 10 which serve as guides for a plate 1 1 slidable therebetween. The plate 11 serves as a vertical draft regulator and isformed with a central vertical slot 12. The post 9 has a horizontal stud 13 which projects loosely through the slot 12 and is t caded toreceiv'e a win wing nut Mserves to hold the p ate 11 in any V-shaped The ribs-6 door 2, but ride over nut 14. The

position to which it maybe moved by engaging the sides of said pl'ate-frictionally in the well known manner.- The lower portion of the late 11 is extended centrally and downwar y to afiord a finger piece 15 by means of which said plate may be raisedfor lowered according to the adjustment'desired;

Means are provided for "positively locking the frame 1 the'above described hinge joint with a catch 16 having .anupwardly inclined front face. The door 2 isprovfided with a resilient latch member .17 rigidly secured at its rear end between lugs 18 and having its free end enlarged The handle 19 catch lfi" when the door is closed an to prevent the same from being opened'except'by lifting the latch member 17. which are bridged by a vertic strap 21 secured thereto at its ends.- I Referring to .Fi s. 3 and'4, I have'illustrated a deflecting ood 22 having an incline end The play of the 1 I latch member 17 is limited by spaced lugs 20 rear wall 23 and straight and parallel sides 24. j I

The latter are formed along their front edges with beads 25 which are positively engagedin conformable overhanging flanges 26 having a slightly downward convergent disposition. This disposition of flanges 26, providcs wide shoulders at the top ends of the flanges, which shoulders are shown as sloping downwardly. As shown in Fig. 2, the sides 24, of hood 22, are provided with upward extensions which are shaped to seat on said shoulders of flanges 26, thus preventing downward movement of the hood.

.The modified embodiment shown in Fig. 6 resides in the construction of the plate 11 and its associated parts. In Fig, 6* the two openings 8 and the post Sare dispensed with and a single enlarged opening" is employed. This; enlarged. opening is not shown since itis in closed by the plate ll, which in its body por tion is iinperforate, said plate being rovided with a central upward extension'2'7 avinga vertical groove 28 therein. The door 2 is provided with threaded stud 29 which projects through the groove 28 and receives an adjusting wing nut 30. The upper end of the extension 27 is bent to form a finger piece 31 for raising and lowering said plate as will be, readily apparent.

In practical use the plate 11 is adjustably I positioned with respect to the openings 8 to increase or decrease thesize of the same in correspondingly regulating the draft therethrough into the furnace. The air induced through the openings 8 is kept from dissipation by the hood 22 and impinges against the inc ined rear wall 23 of said hood by which it is deflected downwardly in a well defined current over the fire where it commingles with the furnace gases.

Having fully described my invention, I claim: I I v l. A door for furnaces having an opening formed therein and provided adjacent the sides of said openin with vertical overhanging flanges, a plate s idably held between said flanges and having a ortion of its materialformed with a vertica slotted opening, said stasis door being formed with a horizontal threaded edges engaged with said flanges and an inclined rear portion. v A door for furnaces having an opening formed therein, vertical overhanging flanges having a downwardly convergent'disposition on the rear face of said door adjacent to the sides ofsaid o ening, a shoulder formed on 'the'top end 0. each flange, a hood having sides, and an inclined rear portion, beads on the 'frontends of said sides engaged with said flanges, and upward extensions formed on the to s of said hood sides to project over the said s oulders of saidflanges and seat thereon to hold the hood against downward movement.

4. A door for furnaces having an opening formed therein, a post extending vertically across said 0 ening at the center of the latter, vertical over anging flanges projecting from the front face of said door ad acent the sides of said opening, a plate slidably held between said flanges and engaging the front face of said post, said plate being formed with-a vertical slot which alines with said post and-is 1.

closed at its rear thereby, a stud projecting from said post through said slot, and anut on said post caring against said plate.

In testimony whereof I aflix my signature, in presence of two witnesses.

- HAZE HAMILTON MAewraE.

Witnesses:

.Tnomiis S. Euss, DAVID Anpnasoir. 

